NAME¶

std::numpunct_byname - std::numpunct_byname

Synopsis¶

Defined in header <locale>
template< class CharT >
class numpunct_byname : public std::numpunct<CharT>;

std::numpunct_byname is a std::numpunct facet which encapsulates numeric punctuation
preferences of a locale specified at its construction.

Two specializations are provided by the standard library

Defined in header <locale>
std::numpunct_byname<char> locale-specific std::numpunct facet for narrow
character I/O
std::numpunct_byname<wchar_t> locale-specific std::numpunct facet for wide
characters I/O

Member types¶

Member type Definition
char_type CharT
string_type std::basic_string<CharT>

Member functions¶

constructor constructs a new numpunct_byname facet
(public member function)
destructor destroys a numpunct_byname facet
(protected member function)

std::numpunct_byname::numpunct_byname

explicit numpunct_byname( const char* name, std::size_t refs = 0 );
explicit numpunct_byname( const std::string& name, std::size_t refs = (since C++11)
0 );

Constructs a new std::numpunct_byname facet for a locale with name.

refs is used for resource management: if refs == 0, the implementation destroys the
facet, when the last std::locale object holding it is destroyed. Otherwise, the
object is not destroyed.

Parameters¶

name - the name of the locale
refs - the number of references that link to the facet

std::numpunct_byname::~numpunct_byname

protected:
~numpunct_byname();

Destroys the facet.

Inherited from std::numpunct

Member types¶

Member type Definition
char_type charT
string_type std::basic_string<charT>

Member functions¶

decimal_point invokes do_decimal_point
(public member function of std::numpunct<CharT>)
thousands_sep invokes do_thousands_sep
(public member function of std::numpunct<CharT>)
grouping invokes do_grouping
(public member function of std::numpunct<CharT>)
truename invokes do_truename or do_falsename
falsename (public member function of std::numpunct<CharT>)

Protected member functions¶

do_decimal_point provides the character to use as decimal point
[virtual] (virtual protected member function of std::numpunct<CharT>)
do_thousands_sep provides the character to use as thousands separator
[virtual] (virtual protected member function of std::numpunct<CharT>)
do_grouping provides the numbers of digits between each pair of thousands
[virtual] separators
(virtual protected member function of std::numpunct<CharT>)
do_truename provides the string to use as the name of the boolean true and
do_falsename false
[virtual] (virtual protected member function of std::numpunct<CharT>)

Member objects¶

static std::locale::id id id of the locale
(public member object)

Example¶

This example demonistrates how to apply numeric punctuation rules of another
language without changing the rest of the locale.

// Run this code

#include <iostream>
#include <locale>
int main()
{
const double number = 1000.25;
std::wcout << L"default locale: " << number << L'\n';
std::wcout.imbue(std::locale(std::wcout.getloc(),
new std::numpunct_byname<wchar_t>("ru_RU.UTF8")));
std::wcout << L"default locale with russian numpunct: " << number << L'\n';
}

Output:¶

default locale: 1000.25
default locale with russian numpunct: 1 000,25

See also¶

numpunct defines numeric punctuation rules
(class template)